225428809 has 2 divisors, whose sum is σ = 225428810. Its totient is φ = 225428808.

The previous prime is 225428771. The next prime is 225428831. The reversal of 225428809 is 908824522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225150025 + 278784 = 15005^2 + 528^2 .

It is a cyclic number.

It is not a de Polignac number, because 225428809 - 2⁹ = 225428297 is a prime.

It is not a weakly prime, because it can be changed into another prime (225428849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112714404 + 112714405.

It is an arithmetic number, because the mean of its divisors is an integer number (112714405).

Almost surely, 2^225428809 is an apocalyptic number.

It is an amenable number.

225428809 is a deficient number, since it is larger than the sum of its proper divisors (1).

225428809 is an equidigital number, since it uses as much as digits as its factorization.

225428809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 225428809 is about 15014.2868295500. The cubic root of 225428809 is about 608.6063399797.

The spelling of 225428809 in words is "two hundred twenty-five million, four hundred twenty-eight thousand, eight hundred nine".